Free Resource: HybridFAST HFX

Photovoltaic and Battery Hybrid System Financial Advisory Spreadsheet Tool

Hybrid System Financial Advisory Spreadsheet Tool

HybridFAST was created as an internal tool for facilitating conversations around the financial implications of grid-interactive photovoltaic (PV) systems, battery energy storage systems (BESS), and hybrid systems utilizing both. It should prove a useful resource for stakeholders and decision makers across multiple sectors, including (but not limited to
  • academia, research and development
  • banking, finance, and insurance
  • engineering and construction
  • electric distribution utilities
  • government and energy policy
HybridFAST is made available for free under a Creative Commons license. There are no macros, and all calculations can easily be reverse-engineered, inspected, and modified. With a minimal investment of time and practice, it can be easily utilized by anyone wishing to understand the financial implications of PV, BESS, and Hybrid systems.


Conversations about the future of our electrical grid are complex. This tool is meant to organize, unify, and enrich those conversations by providing a framework that enables stakeholders to explore new revenue stacks for distributed energy resources (DER) collaboratively, and with intention.


Our hope is to drive grid modernization through increased DER investment. By releasing HybridFAST publicly, we also hope that users will leverage ProtoGen’s expertise to get the most out of the tool and their projects.


ProtoGen is committed to maximizing transparency, inclusion, and access. To that end, we encourage and welcome feedback of any type, which will drive periodic enhancements and debugging.
Contact us to learn how we can provide more in-depth support such as a guided tour of the tool.


HybridFAST is a good-faith attempt to provide an Excel-based model for parties interested in evaluating and understanding distributed energy resource (DER) project economics. HybridFAST does not purport to serve as a replacement for due diligence; its methodology, calculations, and outputs should not be construed to provide investment-grade information for any transaction, investment, liability, or other matter. ProtoGen shall not be responsible for any conclusions, direct or implied, arising from its use; further, ProtoGen and its respective officers, directors, employees, agents, advisers, and representatives make no representations or warranties, expressed or implied, concerning HybridFAST, and make no claim as to the accuracy or appropriateness of the methodology or calculations in relation to any current or future development DER projects.
By downloading or using HybridFAST, you indicate your acceptance of this disclaimer. If you do not accept the disclaimer, but would like further information, please contact ProtoGen directly.

Request Your Free Copy of HybridFAST: